Burner for stereopticon and motion-picture machines.



BURN

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NUNICA, MICHIGAN.

Application filed November 25, 1912.

To all whom, it may concern Be it. known that I, FRANCIS V. BELL, acitizen of the United States, residing at Nunica, in the county ofOttawa and State of Michigan, have invented certain new and usefulImprovements in Burners for Stereopticon and Motion-Picture li lachines,of which the following is a full, clear, and exact specification.

This invention relates to incandescent burners especially designated forstereopticon and motion picture machines.

One object of the invention is to provide an etlicient and economicalsubstitute for the calcium light commonly used in rural districts.

Another object is to employ a plurality of incainilescent mantles insuch relation that they will project a large unbroken field of light ofsubstantially uniform intensity, thereby incrzasing the etfioiency ofthe machine with which the burner is used.

The invention will be first hereinafter described in connection with theaccompanying drawings, which constitute a part of this specification,and then more particularly pointed out in the claims at the end of thedescription.

In the drawings, wherein similar reference characters are used todesignate the same parts throughout: Figure 1 is a front elevation ofone form of burner embodying my invention, Fig. 2 is a plan view of saidburner, and Fig. 3 is a diagrammatic view showing the relative positionsof the mantles to the lens.

As illustrated in the drawings, the burner is adapted to support twoinverted mantles A, A, side by side, and an upright mantle B arranged inalinement with the space between said inverted mantles in the "directionthe light is projected, as illustrated in Fig. 3. In this figure, Edesignates the lens which is shown arranged in front of the group ofmantles. The upright mantle is shown slightly in rear of the invertedmantles, but this arrangement may be reversed, if desired. The uprightmantle is of such size as to overlap the space between the invertedmantles, thereby providing a combined field of light from the threemantles which is unbroken and substantially circular. The upward taper,of the upright mantle corresponds in a sense to the downward curvatureor general taper of the inverted mantles, so that the overlap is not.

Specification of Letters Patent.

Patented Aug. 12,1913.

Serial. No. 733,399.

sufi icient to detract perceptibly from the intensity of the light fromthe rear mantle. The upright n'iantle may extend slightly above andbelow the inverted mantles, as illustrated, thus filling out thesubstantially circular shape of the field of light projected by thecombined mantles.

It is obvious that the gas furnished to the mantles may be prepared invarious ways and from difierent hydrocarbons, such as gasolene,kerosene, or benzin. The gas, however made, may be supplied to all threemantles from the same pressure tank through a single connecting tube(not shown) which may be attached to the end of the pipe C ofthe burnerillustrated. This pipe may be provided with two branches D, D leading,respectively, to the inverted mantles in front and to the upright mantleat the rear. The branch D, leading to the inverted mantles, ispreferably arched, as at (Z, between the two mantles, as to reach abovethe upper end of the upright mantle and, at the same time, bring saidinverted mantles down about midway between the top and bottom of saidupright mantle in order to produce the substantially circular field oflight before mentioned. it is not essential, however, for all themantles to be supplied with gas from the same source. In fact, the formand arrangement of the pipes C, D and I) may be varied to suit difierentconditions without departing from the spirit or sacrificing theadvantages of this invention.

The two inverted mantles may be 600 candle power each, and the uprightmantle from 500 to 1000 candle power, it being understood that theburner is regulated in this respect in order to produce a field of lightof substantially uniform intensity.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is:

1. In an incandescent burner, the combination with two inverted mantlesarranged side by side, of an upright mantle occupying a position inalinement with and overlapping the space between said inverted mantleswhen viewed from the direction in which the light is projected.

2. In an incandescent burner, the combination with two inverted mantlesarranged side by side, of an upright mantle occupying a position inalinement with and overlapping the space between said inverted mantleswhen viewed from the direction in which the light is projected, saidinverted mantles being arranged substantially midway between the top andbottom of said upright mantle, whereby a substantially circular unbrokenfield of light is produced.

3. In an incandescent burner, a plurality of mantles including twoinverted mantles and one upright mantle arranged so that one of saidmantles overlaps the space between the other two, whereby an unbrokenfield of light is produced.

4. In an incandescent burner, the combination with two gas-supply pipes,one arranged in advance of the other and one also occupying a higherlevel than the other, of a pair of inverted mantles carried by thehigher pipe, and an upright mantle carried by the lower pipe andarranged to overlap the space between the inverted mantles.

5. In an incandescent burner, the combination with two gas-supply pipes,one arranged in advance of the other and one also occupying a higherlevel than the other, of a pair of inverted mantles carried by thehigher pipe, and an upright mantle carried by the lower pipe andarranged to overlap the space between the inverted mantles, said uprightmantle extending above the inverted mantles, and the higher pipe beingarched between the latter for the purpose specified.

6. In an incandescent burner, the combination with two inverted mantlesarranged side by side, of an upright mantle occupying a position in rearof said inverted mantles and overlapping the space between them whenviewed from the direction in which the light is projected.

7. The combination with an incandescent burner having two spaced mantlesarranged in a plane transverse to the direction of projection of thelight, and a mantlearranged out of the plane of the first mentionedmantles and overlapping the space between them, of a projector arrangedparallel to the plane of said first mentioned mantles.

S. The combination with an incandescent burner having a central mantle,and smaller mantles arranged at either side thereof and overlapping saidcentral mantle, of a projector in operative relation with said group ofmantles.

9. In an incandescent burner, the combination with a central mantle, ofsmaller mantles arranged at either side thereof and I overlapping saidcentral mantle, the median lines of all of the mantles being arranged inthe same horizontal plane.

10. In an incandescent burner, the combination with upper and lowertubular members having branches extending toward each other, of mantlesmounted on said branches and overlapping one another to produce anunbroken field 01 light of substantially uniform intensity.

In testimony whereof I have signed my name to this specification in thepresence of two attesting witnesses.

FRANCIS WV. BELL. lVitnesses:

JOHN PETERSON, EMIL WV. I-IAss.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

